Efficient Triple Junction Organic Solar Cell

Organic solar cell draws attention because of its low cost and constantly increasing efficiency. Though having many advantages, low power conversion efficiency hinders organic photovoltaic cells from their commercialization. Tandem solar cells combine two or more single junction cells of complementary absorption band undoubtedly provide an effective means to uplift the efficiency organic solar cells. In this paper, we analyze the performance of three individual single junction organic solar cells. Single junction PCDTBT:PCBM cell shows an efficiency of 6.02% whereas PMDPP3T:PCBM and pBBTDPP2:PCBM shows efficiency of 5.99% and 3.15% respectively. Tandem cell consists of PMDPP3T:PCBM and PCDTBT:PCBM shows 10% efficiency with open-circuit voltage 1.48V and short circuit current density of 10.38 mA/cm
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, Using pBBTDPP2:PCBM as a middle layer between them form a triple junction structure that offers an open-circuit voltage of 2.1 V, short circuit current density of 9.4 mA/cm
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and power conversion efficiency of 12.25%, which means improved performance over the double junction structure.